Speedometer.



EDWABJQ A. CAMPBELL, OF ST. LOUIS, MISSOURI.

com'nmnn MUD-GUARD ANDYADVE'RTISFING DEVICE.

' To all wk am it may concern:

Be it k: [own that I, EDWARD A. CAMPBELL, a citizen of the United States, residing at the city of St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Combined Mud-Guards, and Advertising Devices, of which the fol lowing is a specification,- reference being had there1n to the accompanying drawing. My mventlon relates to improvements 1n combined mud-guards and advertising devices, and has for its object to provide a structure to be detachably mounted beneath the mud-guards of an automobile and above the hubs of the rear wheels. The structure so provided serves as an additional mud-- or dust-guard to the regular equipment of the automobile, and also provides a display surface for advertising matter. Furthermore, such advertising matter may be either fixed or changeable; that is to say, I may employ for my advertising supporta plane surface upon which the advertising matter is suitably imprinted or otherwise permanently aflixed, or said support or base may be slotted and provided with channels for the reception of changeable lettered blocks. Another object of my invention is to provide a means of concealing the advertising matter when desired .so that the car upon which the advertising is displayed may be used for pleasure purposes by concealing without removing the sign. The device of my invention is mounted upon the automobile at the only location where a sign of considerable display surface can be mounted without defacing the machine or interferingwith its lights, license, doors or windshield.

In the drawings- Figure 1 is a side elevation of the rear portion of body of an automobile equipped with the device of my invention. I

- Fig. 2 1s a vertical v1ew and cross section,

taken on the line 22 of Fig. 1.

Fig. 3 is the plan view of-the advertising base or support, in the form provided with changeable letters.

Fig. 4 is a vertical transversesectional view of the same.

Fig. 5 is a similarview of the same, with the addition of the plate covering the advertising matter contained in the base or suport. p As shown in the drawings, the device of Specification of Letters Patent.

Patented Mar. 13, 1917.

Application filed September 20, 1915. Serial No. 51,590. w

my invention is adapted to be mounted beneath the mud-guard 10 (see Fig. 1). The base 11 is approximately semi-circular in form and its upper and curved edge is provided-with the outwardly-projecting flange 12. Its lower and straight edge l3is pro gidbed with the recess 14, to fit about the The support 11 is mounted beneath the I mud-guard by means of the series of rings .16, and is held against outward displacement by the cotter-pins 17. The base or sup- ,port 11 is provided with the horizontal apertures 18, at the backs of which apertures 18, the channels 19 are provided to receive the strips or blocks 20, the front faces of said blocks or strips 20 being provided with lettering; I preferably use blocks containsuitable spacing blocks, may be employed to form any desired letter combinations :or

ing single letters which, in conjunction with Y To conceal the advertising matter which is carried by the base or support 11, I emremoving it fromthe car, when the car is used for pleasure traveling. v

The structure thus formed serves prevent the outward and upward splashing of mud from. the wheels 23, or to prevent the dust agitated by such wheels 23 from being driven upwardly and outwardly.

In the construction and mounting of the device of my invention, it will be observed that the device is kept within the outside limits of the mud-guard 10, and inside the I extremity of the hub 15, and that it offers no projection extending beyond said point. Furthermore, the device is mounted where a large display surface is obtainable and without interfering with the display of the license plate, or interfering with the lights displayed upon the automobile.

I have thus shown and described one embodiment of my invention and the structure so described may be varied or altered with- SPEEDOMETER. I APPLICATION FILED .IUNEZI, IBM. RENEWED AUG- B 1916.

Patentd Mar. '13, 1917.

UNITED STATES ALLEN A. CANTON, OF NEW YORK, N. Y., ASSIGNOR TO THE DEVICE TESTING COMPANY A CORPORATION OF CONNECTICUT.

OFFICE.

SPEEDOMETER.

Application'filed June 27, 1914, Serial No. 847,668.

simple and compact construction, comprising but a few parts, and adapted to be manufactured at a low cost.

The speedometer as hereinafter described and as illustrated in the accompanying drawing comprises two main elements, a permanent magnet and two solenoids or coils of wire surrounding said magnet and connected to a source of electrical energy. Either the magnet or the coils of wire are mounted so as to be movable, the arrangement being such that when current is sent through the coils, they cause the movable magnet to move in response to the difference of strength of current in the coils, or these latter are caused to move with respect to the magnet, which in the latter case is fixed. The movement of either one of these two elements is indicated on a suitable scale by means of a pointer. In the said drawings 1 Figure 1 is a face view of a speedometer embodying the invention, parts being vbroken away for the-sake of olearness. r

Fig. 2 is a side view of Fig. 1 with parts in section. These two figures illustrate the type of apparatus in which the coils of wire are mounted to move, while the magnet is stationary.

Figs. 3 and 4 are similar views of the apparatus showing the solenoids as being fixed while the magnet is movable.

Fig. 5 is a wiring diagram.

Referring to Figs. 1 and 2 the reference numeral 6 represents a suitably formed casing for properly containing and supporting the various parts of the instrument. 7 is a permanent magnet secured in a foot or support 8. The magnet is circular in form and spaced a distance away from the bottom of the casing so as to permit the hollow coils of wire 9 and 10 to move with respect to the magnet, the latter passing through the coils as seen in Fig. 2. The coils or solenoids are secured in any suitable manner to a lever 11 secured to a spindle 12 pivoted in the casing Specification of Letters Patent.

series with the coil 9 Patented Mar. 13, 1917.

Renewed August 8, 1916. Serial No. 113,843.

and in a bridge 13, which also servesas a support for an insulating plate 14 to which the Wires 15 and 16 are connected and from which plate the wires pass to the spindle 12 and are wound around the latter and then lead to the coils as shown in Fig.2.

The lever 11 is provided with a toothed rack 17 which meshes with a gear 18 on spindle 19 to which is secured a scale mem ber 20 in the form of a circular disk provided with a properly established scale the .num-

.bers of which may be observed through a window 21 in the cover 22.

The lever 11 I may be provided with a counter balance-23.

Referring now to the diagram in Fig. 5 a source of electrical energy is represented by a battery 25. The c011 9 1s connected across the battery by wires 16, 16 andthe coil- 10 is connected to the battery and in series with an'interrupter 26 which comprises a magnet-- 1zed toothed disk 27 of iron secured to the shaft 28, the speed of which is to be measured, and an oscillating armature of iron 29 magnetized with a magnetism of opposite. polarity to that of the disk 27.

The coils 9 and 10 are so wound that when the current passes through them, they have a tendency to move away from the' poles of the magnet/T. The coils are also proportioned so as to be of diiferent strength, which may be done by-making the coil 10 of a greater number of ampere'turns than the coil 9, or the latter may be "weakeneol by means of a resistance 30 inserted in and the battery as shown.

When the shaft 28 is at rest it follows from the foregoing that the coil 9 being alive, moves away from the north pole of the magnet 7 thereby forcing the coil 1( close to the south pole of the magnet, the lever 11 swinging on the pivot 12 until its movement is arrested by a stop 31 when the 'parts assume a zero position as shown, while the coil 10 is short circuited by the wires 15 and 32 and the interrupter armature 29.

When the shaft 28 commences to rotate the movement of the disk 27 causes the armature29 to oscillate and open the circuit 15, 32 and 29, permitting current impulses .to pass through the coil 10 by way of the wires 15 and 33 between the'coil and the battery. 34 is a. resistance to prevent a short circuit on the battery as will be understood.

The faster the shaft 28 rotates, the faster the 

